ADU rules in Outagamie County, WI — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Outagamie County zoning regulates ADUs only in 13 of 19 unincorporated towns under Wis. Stat. §59.69. The cities of Appleton, Kaukauna, Seymour, and incorporated villages (Kimberly, Little Chute, Combined Locks) administer their own zoning. Wisconsin has no statewide ADU mandate; 2025 Assembly Bill 449 proposing one has not been enacted.
Outagamie County Development and Land Services administers the County Zoning Ordinance under Wis. Stat. §59.69, which authorizes counties to regulate land use in unincorporated areas outside cities and villages. The county zoning ordinance covers 13 of the 19 townships; the remaining six towns and all incorporated jurisdictions zone independently. Any new dwelling unit — primary or accessory — must conform to the Wisconsin Uniform Dwelling Code (Wis. Admin. Code SPS 320-325) and obtain a sanitary permit if served by a private onsite wastewater treatment system. In incorporated cities (Appleton, Kaukauna, Seymour) ADU rules vary by local zoning district.
Zoning violations under Wis. Stat. §59.69(11) carry forfeitures set by ordinance plus daily continuing penalties. Unpermitted dwelling units may require removal or after-the-fact permits.
Outagamie County, WI
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Outagamie County, WI
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Outagamie County, WI
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Outagamie County, WI
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Outagamie County, WI
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Outagamie County, WI
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See how Outagamie County's adu rules rules stack up against other locations.
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